<template>
  <div class="home-category" @mouseleave="curCateId = null">
    <ul class="menu" v-if="$store.state.category.list.length">
      <li
        :class="{ active: curCateId === item.id }"
        v-for="item in cateList"
        :key="item.id"
        @mouseenter="curCateId = item.id"
      >
        <RouterLink to="/">{{ item.name }}</RouterLink>
        <template v-if="item.children">
          <RouterLink to="/" v-for="sub in item.children" :key="sub.id">{{
            sub.name
          }}</RouterLink>
        </template>
        <!-- <RouterLink to="/">二级类目</RouterLink> -->
      </li>
    </ul>
    <template v-else>
      <!-- 结构要和真实的数据一致 -->
      <ul class="menu">
        <li v-for="i in 10" :key="i">
          <XtxSkeleton
            width="50px"
            height="20px"
            bg="rgba(255,255,255,0.2)"
            style="margin-right: 5px"
          />
          <XtxSkeleton
            width="50px"
            height="20px"
            bg="rgba(255,255,255,0.2)"
            style="margin-right: 5px"
          />
          <XtxSkeleton
            width="50px"
            height="20px"
            bg="rgba(255,255,255,0.2)"
            style="margin-right: 5px"
          />
        </li>
      </ul>
    </template>

    <!-- 弹层 -->
    <div class="layer">
      <h4>分类推荐 <small>根据您的购买或浏览记录推荐</small></h4>
      <!-- 分类 -->
      <template v-if="curCate && curCate.goods && curCate.goods.length">
        <ul>
          <li class="brand" v-for="brand in curCate.goods" :key="brand.id">
            <RouterLink :to="'/goods/' + brand.id">
              <img :src="brand.picture" alt="" />
              <div class="info">
                <p class="place">
                  <i class="iconfont icon-dingwei"></i>{{ brand.place }}
                </p>
                <p class="name ellipsis">{{ brand.name }}</p>
                <p class="desc ellipsis-2">{{ brand.desc }}</p>
              </div>
            </RouterLink>
          </li>
        </ul>
      </template>
      <!-- 品牌 -->
      <template v-else>
        <ul v-if="curCate">
          <li v-for="goods in curCate.goods" :key="goods.id">
            <RouterLink to="/">
              <img :src="goods.picture" alt="" />
              <div class="info">
                <p class="name ellipsis-2">{{ goods.name }}</p>
                <p class="desc ellipsis">{{ goods.desc }}</p>
                <p class="price"><i>¥</i>{{ goods.price }}</p>
              </div>
            </RouterLink>
          </li>
        </ul>
      </template>
    </div>
  </div>
</template>

<script>
import { computed, reactive, ref } from 'vue'
import { useStore } from 'vuex'
import { findBrand } from '@/api/home'
export default {
  name: 'HomeCategory',
  setup () {
    const brand = reactive({
      id: 'brand',
      name: '品牌',
      children: [{ id: 'brand-children', name: '品牌推荐' }],
      goods: []
    })
    // 1. 获取vuex的一级分类，并且只需要两个二级分类
    // 2. 需要在组件内部，定义一个品牌数据
    // 3. 根据vuex的分类数据和组件中定义品牌数据，得到左侧分类完整数据(9分类+1品牌)数组
    // 4. 进行渲染即可
    const store = useStore()
    const cateList = computed(() => {
      // 前面九个children截取前面两个
      const list = store.state.category.list.map(item => {
        return {
          id: item.id,
          name: item.name,
          children: item.children && item.children.slice(0, 2),
          goods: item.goods
        }
      })
      // 加上第十个 品牌
      list.push(brand)
      return list
    })

    // 鼠标进入渲染数据
    // 1.记录当前鼠标进入哪个分类,记下编号
    // 2.根据编号去cateList中取出当前要显示的数据
    const curCateId = ref(null)
    const curCate = computed(() => {
      // eslint-disable-next-line eqeqeq
      const cate = cateList.value.find(it => it.id === curCateId.value)
      return cate
    })

    // 请求推荐品牌数据
    findBrand().then(data => {
      brand.goods = data.result
    })

    return { cateList, curCateId, curCate }
  }
}
</script>

<style scoped lang='less'>
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 99;
  .menu {
    li {
      padding-left: 40px;
      height: 50px;
      line-height: 50px;
      &:hover,
      &.active {
        background: @xtxColor;
      }
      a {
        margin-right: 4px;
        color: #fff;
        &:first-child {
          font-size: 16px;
        }
      }
    }
  }
}
.home-category {
  // 省略其他...
  .layer {
    width: 990px;
    height: 500px;
    background: rgba(255, 255, 255, 0.8);
    position: absolute;
    left: 250px;
    top: 0;
    display: none;
    padding: 0 15px;
    h4 {
      font-size: 20px;
      font-weight: normal;
      line-height: 80px;
      small {
        font-size: 16px;
        color: #666;
      }
    }
    ul {
      display: flex;
      flex-wrap: wrap;
      li {
        width: 310px;
        height: 120px;
        margin-right: 15px;
        margin-bottom: 15px;
        border: 1px solid #eee;
        border-radius: 4px;
        background: #fff;
        &:nth-child(3n) {
          margin-right: 0;
        }
        a {
          display: flex;
          width: 100%;
          height: 100%;
          align-items: center;
          padding: 10px;
          &:hover {
            background: #e3f9f4;
          }
          img {
            width: 95px;
            height: 95px;
          }
          .info {
            padding-left: 10px;
            line-height: 24px;
            width: 190px;
            .name {
              font-size: 16px;
              color: #666;
            }
            .desc {
              color: #999;
            }
            .price {
              font-size: 22px;
              color: @priceColor;
              i {
                font-size: 16px;
              }
            }
          }
        }
      }
    }
  }
  &:hover {
    .layer {
      display: block;
    }
  }
}
li.brand {
  height: 180px;
  a {
    align-items: flex-start;
    img {
      width: 120px;
      height: 160px;
    }
    .info {
      p {
        margin-top: 8px;
      }
      .place {
        color: #999;
      }
    }
  }
}
</style>
